61711660511 has 4 divisors (see below), whose sum is σ = 61946305872. Its totient is φ = 61477015152.

The previous prime is 61711660501. The next prime is 61711660523. The reversal of 61711660511 is 11506611716.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 61711660511 - 2²² = 61707466207 is a prime.

It is a super-2 number, since 2×61711660511² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (61711660501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117322286 + ... + 117322811.

It is an arithmetic number, because the mean of its divisors is an integer number (15486576468).

Almost surely, 2^61711660511 is an apocalyptic number.

61711660511 is a deficient number, since it is larger than the sum of its proper divisors (234645361).

61711660511 is a wasteful number, since it uses less digits than its factorization.

61711660511 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 234645360.

The product of its (nonzero) digits is 7560, while the sum is 35.

The spelling of 61711660511 in words is "sixty-one billion, seven hundred eleven million, six hundred sixty thousand, five hundred eleven".